they've created a personality/character to pass the Turing test which isn't necessarily a measure of a machines intelligence it's a measure of it's ability to exhibit intelligence in a similar fashion to humans. There are numerous other areas where AI has surpassed human cognitive ability already.

Simulate an underdeveloped mind IE a child so it can get away with being 'curious' and ask basic questions
Simulate someone not speaking in native tongue so it can get away with giving inaccurate responses
Make the AI seem overly aggressive so dismissive responses seem more natural.

Simulate someone who can have a developed conversation that is coherent and has a train of thought and then we'll be somewhere.